#one{
    width:1000px;
    height: 500px;

    margin:0 auto;
}
li{
    width:137px;
    height:137px;
    margin:10px;
    background-image: url(../img.img/icons.jpg);
    background-repeat: no-repeat;
 
    /*background-color: darkred;*/
    list-style: none;
}
li:nth-child(1){
    background-position: -4px -148px ;
}
li:nth-child(2){
    background-position: -148px -148px ;
}
li:nth-child(3){
    background-position: -870px -148px ;
}
li:nth-child(4){
    background-position: -726px -437px ;
}
li:nth-child(5){
    background-position: -583px -869px ;
}
li:nth-child(6){
    background-position: -439px -724px ;
}
li:nth-child(7){
    background-position: -290px -1016px ;
}
/*最边为4，中间为7，宽高为137*/